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在青少年中,因社会经济地位而有所不同,对奖励的状和行为反应有所不同
Alexandra L Decker1, Steven L Meisler2,3,4, Nicholas A Hubbard5
1McGovern Institute for Brain Research, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 alexandraleerdecker@gmail.com.
概括
社会经济地位 (SES) 影响青少年的奖励敏感性. 较低的SES减弱了奖励驱动的大脑和行为反应,这表明差异影响了青少年如何追求奖励.
科学领域:
- 神经科学是一个神经科学.
- 发展心理学 发展心理学
- 社会经济健康差异差距
背景情况:
- 社会经济地位 (SES) 的差异造成了对资源的不平等获取.
- 假设这些差异会影响奖励灵敏度,影响追求有价值的体验.
- 关于SES如何塑造青少年的奖励敏感性,人们知之甚少.
研究的目的:
- 研究SES如何影响青少年对奖励的行为和条纹反应.
- 检查即时奖励 (阶段性多巴胺) 和平均奖励率 (强力多巴胺) 的效应.
- 了解多巴胺信号在学习和动机中的独立作用.
主要方法:
- 招募了114名青少年 (12-14岁,58%是女性).
- 在博任务中使用功能磁共振成像 (fMRI).
- 操纵逐个试验的奖励/损失结果,以创建奖励稀缺/丰富时期.
主要成果:
- 更高的奖励率加速了行为和增加了探索 (猜测切换).
- 立即的奖励强化了过去的选择,并导致奖励后的暂停,特别是在稀缺期间.
- 与SES较高的同龄人相比,低SES的青少年在罕见的奖励后显示出较少的奖励后暂停.
- 条形状激活跟踪奖励率波动,并且在较低SES的青少年中减少.
结论:
- 条纹体跟踪奖励率波动,影响决策和动机.
- 较低的SES似乎会减弱青少年的奖励驱动的行为和神经反应.
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